Question # 1

Which one of the halogen acid is a liquid?

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HF

HCl

HBr

Hl

Cyclone collector is used for minimizing

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Radioactive pollution

Air pollution

Noise pollution

Water pollution

On heating acetaldehyde with ammonical silver nitrate solution, we get

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CH₃OH

Silver acetate

HCHO

Silver mirror

Which of the following is a colligative property?

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Melting point

Osmotic pressure

Freezing point

Sublimation temperature

Iron, once dipped in concentrated H₂SO₄, does not displace copper from copper sulphates solution, because

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It is less reactive than copper

A layer of sulphates is deposited on it

An inert layer of iron oxide is deposited on it.

All valence electrons of iron are consumed.

When electricity is passed through moten Al₂O₃+Na₃AIF₆and 13.5 gms of Al are deposited, the number of faraday must be

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0.5

1.0

1.5

2.0

Bromine is obtained on a commercial scale from

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Caliche

Carnallite

Common satl

Cryolite

The rate at which a substance reacts depends on its

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Atomic weight

Equivalent weight

Molecular weight

Active mass

Natural fertilizer provides phosphorus to plants in the form of P₂O₅

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1.2 kg

2.2 kg

3.2 kg

4 kg

Formic acid is obtained when

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Calcium acetate is heated with conc. H₂SO₄

Calcium formate is heated with calcium acetate

Glycerol is heated with oxalic acid

Acetaldehyde is oxidized with K2Cr₂O₇ and H₂SO₄

For most of the chemical reactions the rate of reaction

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Increase as the reaction proceeds

Decrease as the reaction proceeds

May increase or decrease during the reaction

Remains constant as the reaction proceeds

Which for the following has greatest reducing power?

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Hl

HBr

HCl

Hl

What happens when isotonic solution of a (mol. wt. 342) and B (mol. wt 60) are put in to communication through semiperme-able membrane?

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Transference of solvent from solution A to that of B take place

Transference of solvent from solution B to that of A takes place

No transference of solvent from solution A to that of B takes place

Change in temperature of solutions takes place.

Covalent compounds are soluble in

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Polar solvents

Non-polar solvents

Concentrated acids

All solvents

When electrons revolve in stationary orbits,

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There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

The ratio of the ionization energy of H and Be³⁺is

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1 : 1

1 : 3

1 : 9

1 : 16

ΔH_{neutralisation}is always

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positive

Negative

Zero

Positive or negative

Bell metal is an alloy of

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Cu, Zn and Sn

Cu, Zn and Ni

Cu and Zn

Cu and Sn

Bleaching action of bleaching powder is due to the liberation of

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O₂

OCl^-

Cl₂

Cl^-

In N.W.F.P the phosphate fertilizers are produced at

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D.I.Khan

Haripur

Nowshera

Dargai

The number of oxygen atoms in 4.4 g of CO₂is approximately

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1.2 x 10²³

6 x 10²²

6 x 10²³

12 x 10²³

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